.tips-bg {
  background: url("../imgs/smile-bg.png") no-repeat center;
  margin: 0 auto 20px;
  width: 90%;
  height: 498px;
  position: relative;
  .tips {
    background: url("../imgs/smile-innerbox.png") no-repeat center;
    width: 400px;
    height: 129px;
    position: absolute;
    bottom: 0;
    left: 50%;
    margin-left: -200px;
    margin-bottom: 50px;
    text-align: center;
    font-size: 20px;
    line-height: 129px;
  }
}

.tips {
  margin-bottom: 50px;
  text-align: center;
  font-size: 20px;
}